Abstract: A hollow body having means for connecting several bodies together, the hollow body consisting of two identical shell halves of synthetic material. The halves are provided with ribs and grooves and openings through which pass fixation elements. The hollow body further includes a boring which receives the connection elements, in order to connect several hollow bodies in a detachable manner. At least the top and bottom surfaces are concave, textured and have a plurality of holes whereby the playing surface is made less slippery when wet.